My PC started crashing in Dec when playing Shaiya

And it stops with BSOD BCCode 116 which points to the graphics card. I have done everything I know how to do, including reseating the card and cleaning every fan there is and I get the same results. I even rolled back my video driver, with no change. The last test I did was to run another, graphics intensive game last night. I had no problem at all.....

It only crashes in this game and all I do to test it is set up a tiny market (in APU no less!) and let it sit. Usual crash time is 30 min, although I have seen it run 2 hrs and then BSOD.

It started sometime in early December ( before the XMAS update) and is very annoying. I will not bother to play while this is ocurring.